clueless

Command: cat /etc/udev/rules.d/z20_persistent-input.rulesSUBSYSTEM!="input",			GOTO="persistent_input_end"ACTION!="add",				GOTO="persistent_input_end"# ignore the mid-level driversKERNEL=="input[0-9]*",			GOTO="persistent_input_end"# usb devicesSUBSYSTEMS=="usb",			IMPORT{program}="usb_id -x"SUBSYSTEMS=="usb", \	ATTRS{bInterfaceClass}=="03", ATTRS{bInterfaceProtocol}=="01", \					ENV{ID_CLASS}="kbd"SUBSYSTEMS=="usb", \	ATTRS{bInterfaceClass}=="03", ATTRS{bInterfaceProtocol}=="02", \					ENV{ID_CLASS}="mouse"# other devicesDRIVERS=="pcspkr",			ENV{ID_CLASS}="spkr"DRIVERS=="atkbd",			ENV{ID_CLASS}="kbd"DRIVERS=="psmouse",			ENV{ID_CLASS}="mouse"ATTRS{name}=="*dvb*|*DVB*|* IR *",	ENV{ID_CLASS}="ir"# this means (ABS_X || ABS_WHEEL || ABS_THROTTLE) && !BTN_TOUCHATTRS{modalias}=="input:*-*a[068],*|input:*-*a*,[68],*m*", \	ATTRS{modalias}!="input:*-*k*14A,*r*", \					ENV{ID_CLASS}="joystick"ENV{ID_SERIAL}=="",			ENV{ID_SERIAL}="noserial"# by-id links, generic and for the event devicesKERNEL=="mouse*", ENV{ID_BUS}=="?*", ENV{ID_CLASS}=="?*", \	SYMLINK+="input/by-id/$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_CLASS}"KERNEL=="event*", ENV{ID_BUS}=="?*", ENV{ID_CLASS}=="?*", \	SYMLINK+="input/by-id/$env{ID_BUS}-$env{ID_SERIAL}-event-$env{ID_CLASS}"# by-path linksIMPORT{program}="path_id %p"KERNEL=="mouse*", ENV{ID_PATH}=="?*", \	SYMLINK+="input/by-path/$env{ID_PATH}-$env{ID_CLASS}"KERNEL=="event*", ENV{ID_PATH}=="?*", \	SYMLINK+="input/by-path/$env{ID_PATH}-event-$env{ID_CLASS}"LABEL="persistent_input_end"